While I might enjoy watching such a competition, I would probably never enter one. I have a hard enough time losing a karaoke contest; I would never want to even conceive of the idea of aikidoka sleeping with the judges for better scores. That's not to say that I would take such an idea seriously, but things flash into my mind without warning or reason sometimes, and I'd prefer that that not be one of them.
Having winners means having losers too, and that strikes me as contrary to the very essence of aikido. I think Aiki Expo is great the way it is.